/**
 * @Class Request
 * @description luch-request http请求插件
 * @Author lu-ch
 * @Email webwork.s@qq.com
 * 文档: https://www.quanzhan.co/luch-request/
 * github: https://github.com/lei-mu/luch-request
 * DCloud: http://ext.dcloud.net.cn/plugin?id=392
 */


import dispatchRequest from './dispatchRequest'
import InterceptorManager from './InterceptorManager'
import mergeConfig from './mergeConfig'
import defaults from './defaults'
import {
	isPlainObject
} from '../utils'
import clone from '../utils/clone'

export default class Request {
	/**
	 * @param {Object} arg - 全局配置
	 * @param {String} arg.baseURL - 全局根路径
	 * @param {Object} arg.header - 全局header
	 * @param {String} arg.method = [GET|POST|PUT|DELETE|CONNECT|HEAD|OPTIONS|TRACE] - 全局默认请求方式
	 * @param {String} arg.dataType = [json] - 全局默认的dataType
	 * @param {String} arg.responseType = [text|arraybuffer] - 全局默认的responseType。支付宝小程序不支持
	 * @param {Object} arg.custom - 全局默认的自定义参数
	 * @param {Number} arg.timeout - 全局默认的超时时间，单位 ms。默认60000。H5(HBuilderX 2.9.9+)、APP(HBuilderX 2.9.9+)、微信小程序（2.10.0）、支付宝小程序
	 * @param {Boolean} arg.sslVerify - 全局默认的是否验证 ssl 证书。默认true.仅App安卓端支持（HBuilderX 2.3.3+）
	 * @param {Boolean} arg.withCredentials - 全局默认的跨域请求时是否携带凭证（cookies）。默认false。仅H5支持（HBuilderX 2.6.15+）
	 * @param {Boolean} arg.firstIpv4 - 全DNS解析时优先使用ipv4。默认false。仅 App-Android 支持 (HBuilderX 2.8.0+)
	 * @param {Function(statusCode):Boolean} arg.validateStatus - 全局默认的自定义验证器。默认statusCode >= 200 && statusCode < 300
	 */
	constructor(arg = {}) {
		if (!isPlainObject(arg)) {
			arg = {}
			console.warn('设置全局参数必须接收一个Object')
		}
		this.config = clone({
			...defaults,
			...arg
		})
		this.interceptors = {
			request: new InterceptorManager(),
			response: new InterceptorManager()
		}
	}

	/**
	 * @Function
	 * @param {Request~setConfigCallback} f - 设置全局默认配置
	 */
	setConfig(f) {
		this.config = f(this.config)
	}

	middleware(config) {
		config = mergeConfig(this.config, config)
		let chain = [dispatchRequest, undefined]
		let promise = Promise.resolve(config)

		this.interceptors.request.forEach(function unshiftRequestInterceptors(interceptor) {
			chain.unshift(interceptor.fulfilled, interceptor.rejected)
		})

		this.interceptors.response.forEach(function pushResponseInterceptors(interceptor) {
			chain.push(interceptor.fulfilled, interceptor.rejected)
		})

		while (chain.length) {
			promise = promise.then(chain.shift(), chain.shift())
		}

		return promise
	}

	/**
	 * @Function
	 * @param {Object} config - 请求配置项
	 * @prop {String} options.url - 请求路径
	 * @prop {Object} options.data - 请求参数
	 * @prop {Object} [options.responseType = config.responseType] [text|arraybuffer] - 响应的数据类型
	 * @prop {Object} [options.dataType = config.dataType] - 如果设为 json，会尝试对返回的数据做一次 JSON.parse
	 * @prop {Object} [options.header = config.header] - 请求header
	 * @prop {Object} [options.method = config.method] - 请求方法
	 * @returns {Promise<unknown>}
	 */
	request(config = {}) {
		return this.middleware(config)
	}

	get(url, options = {}) {
		return this.middleware({
			url,
			method: 'GET',
			...options
		})
	}

	post(url, data, options = {}) {
		return this.middleware({
			url,
			data,
			method: 'POST',
			...options
		})
	}

	// #ifndef MP-ALIPAY || MP-KUAISHOU || MP-JD
	put(url, data, options = {}) {
		return this.middleware({
			url,
			data,
			method: 'PUT',
			...options
		})
	}

	// #endif

	// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-BAIDU
	delete(url, data, options = {}) {
		return this.middleware({
			url,
			data,
			method: 'DELETE',
			...options
		})
	}

	// #endif

	// #ifdef H5 || MP-WEIXIN
	connect(url, data, options = {}) {
		return this.middleware({
			url,
			data,
			method: 'CONNECT',
			...options
		})
	}

	// #endif

	// #ifdef  H5 || MP-WEIXIN || MP-BAIDU
	head(url, data, options = {}) {
		return this.middleware({
			url,
			data,
			method: 'HEAD',
			...options
		})
	}

	// #endif

	// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-BAIDU
	options(url, data, options = {}) {
		return this.middleware({
			url,
			data,
			method: 'OPTIONS',
			...options
		})
	}

	// #endif

	// #ifdef H5 || MP-WEIXIN
	trace(url, data, options = {}) {
		return this.middleware({
			url,
			data,
			method: 'TRACE',
			...options
		})
	}

	// #endif

	upload(url, config = {}) {
		config.url = url
		config.method = 'UPLOAD'
		return this.middleware(config)
	}

	download(url, config = {}) {
		config.url = url
		config.method = 'DOWNLOAD'
		return this.middleware(config)
	}

	get version() {
		return '3.1.0'
	}
}


/**
 * setConfig回调
 * @return {Object} - 返回操作后的config
 * @callback Request~setConfigCallback
 * @param {Object} config - 全局默认config
 */